Ah, I see... well I'd try to remove any permissions you can and explain somewhere in the description that the permissions are for syncing. Also, buy your app and give it 5 stars, so people can see a rating.

I've been looking for other japanese learning apps in the market, they don't seem to be doing very well. I hope you do well but maybe you won't be able to get paid enough for all the effort you've put making the app.

These are my opinions I could be totally wrong of course.